Website stops working after installation

Your plugin used to work before on my website. I installed new wordpress update and then I got some session errors. I removed plugin, reinstalled and then it was saying:

error on line 2 at column 1: Extra content at the end of the document
Below is a rendering of the page up to the first error.

It blocked the whole website so I removed it. Does your script require an update to match the new wordpress?

https://wordpress.org/plugins/accesspress-social-share/